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Template:Sequence of the Day for September 12

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Intended for: September 12, 2011

Timetable

  • First draft entered by Alonso del Arte on May 31, 2011 (as a verbatim copy of the write-up from December 12, 2010) ✓
  • Draft reviewed by Alonso del Arte on August 11, 2011
  • Draft approved by Daniel Forgues on September 11, 2012
Yesterday's SOTD * Tomorrow's SOTD

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A005224: Aronson’s sequence.

“{ T is The firsT, fourTh, elevenTh, sixTeenTh, TwenTy-fourTh, TwenTy-ninTh, ThirTy-Third, ... } letter in this sentence, not counting spaces or commas”—A. J. Aronson

giving the sequence of ordinal numbers (expressed as decimal Hindu-Arabic numerals instead of English literals!)

{ 1, 4, 11, 16, 24, 29, 33, ... }

In his paper “Seven Staggering Sequences,” Neil Sloane named Aronson’s quote above as “a classic self-referential assertion,” since it “indicates exactly which of its terms are t’s.”